How do I put Detailed Scenes in Blender
Yes, there is: You need to separate each character into a render layer. And use MASK and EXCLUSION. That´s for an advanced setup. It´s the only way your machine can render 1 character at the time. Later on the compositor, you can place them all back as renders on the same frame.
Otherwise: yes, your machine will keep crashing because of short RAM memory.

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BFCT_Schiller